Interested in Hugh Hefner?

Kendra Wilkinson and Bridget Marquardt, two of the three stars of "Girls Next Door," the E! reality show that focused on Hefner's girlfriends from 2005 until 2010, expressed their sentiments in an Instagram post.

"So sad but forever grateful for all the wonderful memories and amazing experiences," Marquardt wrote.

Pamela Anderson, who appeared on the cover of Playboy 14 times, shared a video on Instagram that featured her crying as she said a final goodbye to the magazine publisher.

"I am me because of you. You taught me everything important about freedom and respect. Outside of my family, you were the most important person in my life. You gave me my life," she wrote in a lengthy caption. "I'm in such deep shock. But you were old, your back hurt you so much. Last time I saw you, you were using a walker. You didn't want me to see. You couldn't hear. You had a piece of paper in your pocket you showed me - with my name Pamela with a heart around it.

"Thank you for making the world a better place. A freeer and sexier place," she continued. "You were a gentleman: charming, elegant, chivalrous and so much fun."